gnu: chrony: Use G-expressions.

* gnu/packages/ntp.scm (chrony)[arguments]:
Rewrite as G-expressions.

gnu/packages/ntp.scm

@@ -57,28 +57,31 @@
         (base32 "123h2a9rpc6wbvnysvhl5pmckvynzrnqay7l00i18azrvbk0gyza"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:modules ((srfi srfi-26)
-                  (guix build utils)
-                  (guix build gnu-build-system))
-       #:configure-flags
-       (list "--enable-scfilter"
-             "--with-sendmail=sendmail"
-             "--with-user=chrony")
-       #:phases
-       (modify-phases %standard-phases
-         (add-after 'unpack 'stay-inside-out
-           ;; Simply setting CHRONYVARDIR to something nonsensical at install
-           ;; time would result in nonsense file names in man pages.
-           (lambda _
-             (substitute* "Makefile.in"
-               (("mkdir -p \\$\\(DESTDIR\\)\\$\\(CHRONYVARDIR\\)") ":"))))
-         (add-after 'install 'install-more-documentation
-           (lambda* (#:key outputs #:allow-other-keys)
-             (let* ((out (assoc-ref outputs "out"))
-                    (doc (string-append out "/share/doc/" ,name "-" ,version)))
-               (for-each (cut install-file <> doc)
-                         (list "README" "FAQ"))
-               (copy-recursively "examples" (string-append doc "/examples"))))))))
+     (list
+      #:modules
+      '((srfi srfi-26)
+        (guix build utils)
+        (guix build gnu-build-system))
+      #:configure-flags
+      #~(list "--enable-scfilter"
+              "--with-sendmail=sendmail"
+              "--with-user=chrony")
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'stay-inside-out
+            ;; Simply setting CHRONYVARDIR to something nonsensical at install
+            ;; time would result in nonsense file names in man pages.
+            (lambda _
+              (substitute* "Makefile.in"
+                (("mkdir -p \\$\\(DESTDIR\\)\\$\\(CHRONYVARDIR\\)") ":"))))
+          (add-after 'install 'install-more-documentation
+            (lambda _
+              (let* ((doc (string-append #$output "/share/doc/"
+                                         #$name "-" #$version)))
+                (for-each (cut install-file <> doc)
+                          (list "README" "FAQ"))
+                (copy-recursively "examples"
+                                  (string-append doc "/examples"))))))))
     (native-inputs
      (list pkg-config))
     (inputs